The present invention relates to a novel process for preparing cis-4-O-protected-substituted-2-cyclopentenol derivatives comprising, a) dissolving a 4-O-protected-2-cyclopentenone in a suitable organic solvent; and b) treating the solution with a suitable Lewis acid and a suitable reducing agent at a temperature of from about -100.degree. C. to about 20.degree. C. The cis-4-O-protected-substituted-2-cyclopentenol derivatives are useful intermediates in the preparation of various cyclopentanyl and cyclopentenyl purine analogs which are useful as immunosuppressants and in the preparation of various prostaglandins.
本发明涉及一种制备顺式4-O-保护取代的2-
环戊烯醇衍
生物的新工艺,包括:a)在适宜的有机溶剂中溶解4-O-保护的
2-环戊烯酮;b)在温度从约-100℃到约20℃的条件下,用适宜的Lewis酸和适宜的还原剂处理溶液。顺式4-O-保护取代的2-
环戊烯醇衍
生物是制备各种环戊苯基和
环戊烯基
嘌呤类似物的有用中间体,这些类似物可用作
免疫抑制剂和制备各种
前列腺素的原料。